Dynamical Packing in the Habitable Zone: The Case of Beta CVn

Abstract

Uncovering the occurrence rate of terrestrial planets within the Habitable Zone (HZ) of their host stars has been a particular focus of exoplanetary science in recent years. The statistics of these occurrence rates have largely been derived from transiting planet discoveries, and have uncovered numerous HZ planets in compact systems around M dwarf host stars. Here we explore the width of the HZ as a function of spectral type, and the dynamical constraints on the number of stable orbits within the HZ for a given star. We show that, although the Hill radius for a given planetary mass increases with larger semi-major axis, the width of the HZ for earlier-type stars allows for more terrestrial planets in the HZ than late-type stars. In general, dynamical constraints allow $\sim$6 HZ Earth-mass planets for stellar masses $\gtrsim 0.7M_{\odot }$, depending on the presence of farther out giant planets. As an example, we consider the case of Beta CVn, a nearby bright solar-type star. We present 20 years of radial velocities (RV) from the Keck/HIRES and APF instruments and conduct an injection-recovery analysis of planetary signatures in the data. Our analysis of these RV data rule out planets more massive than Saturn within 10~AU of the star. These system properties are used to calculate the potential dynamical packing of terrestrial planets in the HZ and show that such nearby stellar targets could be particularly lucrative for HZ planet detection by direct imaging exoplanet missions.

arXiv comment10 pages, 6 figures, 2 tables, accepted for publication in the Astronomical Journal

References in corpus (67)

• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• Habitable Zones Around Main-Sequence Stars: New Estimates
• Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
• The Keck Planet Search: Detectability and the Minimum Mass and Orbital Period Distribution of Extrasolar Planets
• The NASA Exoplanet Archive: Data and Tools for Exoplanet Research
• Giant Planet Occurrence in the Stellar Mass-Metallicity Plane
• Habitable Zones Around Main-Sequence Stars: Dependence on Planetary Mass
• The HARPS search for southern extra-solar planets XXXI. The M-dwarf sample
• The Occurrence Rate of Small Planets around Small Stars
• RadVel: The Radial Velocity Modeling Toolkit
• A dynamically-packed planetary system around GJ667C with three super-Earths in its habitable zone
• State of the Field: Extreme Precision Radial Velocities
• A seven-planet resonant chain in TRAPPIST-1
• The California-Kepler Survey V. Peas in a Pod: Planets in a Kepler Multi-planet System are Similar in Size and Regularly Spaced
• The Habitability of Planets Orbiting M-dwarf Stars
• Limits on Planetary Companions from Doppler Surveys of Nearby Stars
• A revised estimate of the occurrence rate of terrestrial planets in the habitable zones around kepler m-dwarfs
• Exoplanet population inference and the abundance of Earth analogs from noisy, incomplete catalogs
• Exploring The Frequency Of Close-In Jovian Planets Around M Dwarfs
• Stellar Diameters and Temperatures I. Main Sequence A, F, & G Stars
• APF - The Lick Observatory Automated Planet Finder
• Challenges in Planet Formation
• Directly Determined Linear Radii and Effective Temperatures of Exoplanet Host Stars
• The CARMENES search for exoplanets around M dwarfs. Two temperate Earth-mass planet candidates around Teegarden's Star
• A Catalog of Kepler Habitable Zone Exoplanet Candidates
• Constructing the secular architecture of the solar system II: The terrestrial planets
• Chaos in the Solar System
• Jupiter's Decisive Role in the Inner Solar System's Early Evolution
• Terrestrial Planet Formation in Disks with Varying Surface Density Profiles
• Are Planetary Systems Filled to Capacity? A Study Based on Kepler Results
• Debris disks as signposts of terrestrial planet formation. II Dependence of exoplanet architectures on giant planet and disk properties
• The (In)Stability of Planetary Systems
• The Habitable Zone Gallery
• The Anglo-Australian Planet Search XXIV: The Frequency of Jupiter Analogs
• On the Frequency of Potential Venus Analogs from Kepler Data
• The stability of tightly-packed, evenly-spaced systems of Earth-mass planets orbiting a Sun-like star
• Constraining Orbital Parameters Through Planetary Transit Monitoring
• The statistical mechanics of planet orbits
• Candidate Planets in the Habitable Zones of Kepler Stars
• Jupiter - friend or foe? I: the asteroids
• Effects of Dynamical Evolution of Giant Planets on Survival of Terrestrial Planets
• The planet search programme at the ESO CES and HARPS. IV. The search for Jupiter analogues around solar-like stars
• Architectures of Planetary Systems and Implications for their Formation
• The Habitable Exoplanet Observatory (HabEx) Mission Concept Study Interim Report
• Effects of Unseen Additional Planetary Perturbers on Compact Extrasolar Planetary Systems
• Precision radial velocities of double-lined spectroscopic binaries with an iodine absorption cell
• Impacts of stellar evolution and dynamics on the habitable zone: The role of rotation and magnetic activity
• Exploring Kepler Giant Planets in the Habitable Zone
• Astrobiologically Interesting Stars within 10 parsecs of the Sun
• The K Dwarf Advantage for Biosignatures on Directly Imaged Exoplanets
• Pileups and Migration Rates for Planets in Low Mass Disks
• The Impact of Stellar Distances on Habitable Zone Planets
• Stability analysis of single planet systems and their habitable zones
• The Pan-Pacific Planet Search. VIII. Complete results and the occurrence rate of planets around low-luminosity giants
• Optimizing exoplanet transit searches around low-mass stars with inclination constraints
• ExoCat-1: The Nearby Stellar Systems Catalog for Exoplanet Imaging Missions
• Revised Exoplanet Radii and Habitability Using Gaia Data Release 2
• Joint Radial Velocity and Direct Imaging Planet Yield Calculations: I. Self-consistent Planet Populations
• Worlds Without Moons: Exomoon Constraints for Compact Planetary Systems
• Maximum Angular Separation Epochs for Exoplanet Imaging Observations
• In the Presence of a Wrecking Ball: Orbital Stability in the HR 5183 System
• Quantifying the Influence of Jupiter on the Earth's Orbital Cycles
• Solar System Moons as Analogs for Compact Exoplanetary Systems
• Predicting multiple planet stability and habitable zone companions in the TESS era
• Stability of additional planets in and around the habitable zone of the HD 47186 Planetary System
• Exo-Earth/Super-Earth Yield of JWST plus a Starshade External Occulter

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• New Dynamical State and Habitability of the HD 45364 Planetary System
• Guest Editorial: Overview of the Special Issue and a Dialog on Starshades